Necessary and Impossible by Henri Cole   I think the reason why I first took note of “Necessary and Impossible” when I read Henri Cole’s Middle Earth was the resonance it shares with Czeslaw Milosz’s “Incantation.” I’d once committed Milosz’s poem to memory, partially because I loved the grand, authoritative, risky pronouncements it makes: which begins “Human reason is beautiful and invincible. […] It puts what should be above things as they are, / Is an enemy of despair and a friend of hope. […] It saves austere and transparent phrases / From the filthy discord of tortured words.” The opening of Cole’s poem embodies that same sense of grandness: “It is a nation born in the quiet part of the mind, / that…